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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956de06bc46ba487d76ba865d491bff82d77e0ae37a6f5b865bcafdb2a003fdc' 
  AND token = 'arCP486zparDvSZdxCaVJ+9evEP0IQJS5P26r6fizpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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