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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae07f3c2f5b13de2a0cb7eefd2ce8bd91bb14a3e4d2cb7ef3be0c50fc74d17d5' 
  AND token = 'mi2BQ6Tu25Szm3hBS3AW0ZJQMnu1vXVw8NBA4hgR6a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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