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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02371f5cae45ff07499be9e970270e7d9542f8239ef51031613eb240098ebb45' 
  AND token = '6+l6z5iQszeY4wFo/LCoxysSrbsLwrPJnXRX3JG5oVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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