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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9053034ffd366a4f8adac16c92e123fc1c9d6c5baf78a29c59507bb6d29cac' 
  AND token = 'M5I7pug+987ZEPGDbh94VpsldDiJ0cBjSywwrt3sgqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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