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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6657817b1e28658c2f39e28b7e9b9763499d8a53a80009fa50593f71b0a31366' 
  AND token = '9JlLjKK97NbYAV7kJfRkB53BDyqhg1LyRyc/WR9W2MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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