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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fe9663390a61f60bb16456df8ea617df437ff3602b1f9af69de3fa1c1fb3a7' 
  AND token = 'SneHg7UhLiuFv9XZfmHKlMY/gFhe9Y6fgk+uPBoru1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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