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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78fadb4cd13eac605dc41a98670ded8c206f40c0c85ab2f7976a3e0a1d0bbfd9' 
  AND token = 'zMHu8Te10VnTxeuKreztvVnYnyyS2qqGkcuedNNELjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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