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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4ef99f935c9bf3224ca7ae9385a91248959cb37f5ad98fda085c5895cdb490' 
  AND token = 'Oz6A0wEx7SNbWSGpwnrbjt489P2o9WMQDop2Q8kC/Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}