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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21b36a21a6454cd54e95ff0c6df4df85a46174ba70dc3fc3c804b62407f535ec' 
  AND token = 'm04G93bp4QWvp27NRN2YStVN+3wje+ITVcp+Gp59uWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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