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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a393d4fc1f5f7dde0f14e81257a25fd1193389182f9fcf89089a0a90115a55b1' 
  AND token = 'Wp7IFFHBIfFj6Yl4c6QJm/uFU0pst3IPKaV4nyVJhEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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