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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c343b9e5d2c44767f7a59ae1b5779dca6e41c0f709d9394bdff0588566ffa58d' 
  AND token = 'saoDZqCfNg0X0egkbdOD2K0lYd0Ip3ZnO3O1tiSOS/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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