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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84a5150214e020bd6a65456d43e296ce99cd3b3689cefe412791c4f81fd2134' 
  AND token = 'NISyTFUWLyFzbdOfwpcgPzs2+fQHOjVWO+AMXeoZXek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00488

JSON explain

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