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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242e22ca03935f1dc05432d81a22d550322567abcfa0071f316d25bffe28dd9e' 
  AND token = '/2tcKZk0kqMrxOAnLwMV3cFJ146iVzwVal47G0Sp34I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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