SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62265f0cb5c96c864134fbb4df6977dc68b95c2afd1423334c5dafede3b4a5ab' 
  AND token = '1C/IbDLAsRhl1FzKQV1OvrYcqFFD3p8v/+bG1E9xvT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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