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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa81a1a8d7ee758e26a39dd7d7ece06e6b4d444c8b8d5adc7f899a99ba7fae93' 
  AND token = 'I0NK8Umw1JQcHq1fkM5xtYScdlGZTjJk9OGhAwfpIlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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