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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee10cce86a9095400b9a13de5cae12ba8acd772d64308fc1dd0d5f99cfc5aa9' 
  AND token = 'tc5QvMPJj8XC9okoF8PSbwIo9Kv58LwThvhoQNWnthc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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