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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d5d4d906aa07c0c5ff0b4d7a5d6d2a78cc5fff4dd4d9f806d932eb95d75bce' 
  AND token = 'q06kuCjVq8dWQU2oWiTjyIRvb0xydeWm4hngw0tILsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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