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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629e317b8813bd3db0ef7be48d8212cb59166fd4da31d6c995cafe387e55010b' 
  AND token = 'T/dMLyeGjHb0dLg3Gi618K9MANP8FJW3nK58jU6383U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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