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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc402ed9731656464e9c46992900e9c00b40dad96d47449c1f0adabae4ce4f8' 
  AND token = 'YvriYxWf30r8xWDlFhA1m+PPoeLVAuGea/3hQ4ziPoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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