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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d745cd39a857a56653d17d3b9a232d80f9b44ee1fb93379304977ebf4eeee61' 
  AND token = 'qojXXJENs7e/V6nLvLKrw8oxO6crd4Xc+idMi34NmYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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