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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be436c5e28c16b855ef587a82b71bc28930a23cbdae8613729bad2159798573' 
  AND token = '2oGfuSr5HZT5MQigkdLqi6v3eoAGL6qpTZg6I9xIs2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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