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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b3339cd71572fd9c158ff0cdf1e1beb09d6e99501c2af6eacc0eeec5edd9ee' 
  AND token = '4G6+Cnje2c/SrbAQUgOaJ2CDyjn/pbZ/OaN5FUThPo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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