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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a98fc702789b593738128f4c08cdb1a08a4373f8916ea20a3cad785bd3efebc' 
  AND token = 'Us/1k1mpdQpOyYQIpUOGfsmgFmVhbdbt41NYxV6O75k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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