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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b88fa23bbfe2b093e478c6daf1303a3791817d25cce0ecc6dd7209bc53f119d' 
  AND token = 'YesqzxcoXEFv3+0E7Q+snFfOxRlBzKe2ZqTGxLOcXhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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