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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9589b97046983b3941b5cd2a8f765e31c975b0bc515a6b4320c91b93b6414331' 
  AND token = '3WASUwgObo4zZCghO6F7sDzvF7ue7cdu0ZeSYzuY/AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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