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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d41f92ca0f9253fdbd0413832c63a399735430507eae43917c84c93c7e5639' 
  AND token = 'wJQZGg+Y5Co4Tzdms0wR1nm4r4OTBh41aljoBmTgbOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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