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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7975517d4c1f8361c9b909051f1ed2d2cffb4c60ad7b7e5fa06db5cd8d657e' 
  AND token = 'W6Da/gWi+OzTndSRmoUxMlst86YNquzE4K6EpTw7eXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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