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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a9d14ec4434e652b50ade692d5b9d55b292bab609e5b0dc2ab90c2e2eaa95d' 
  AND token = '0i0/re4+VtOJmhexNK7V+FLjYFizKRVZ5S5atiJ8OXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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