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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67582d1ebd1b533790b52d6c4999b13bb8b7dd224f39ee52b5e1ab0d1c577cf' 
  AND token = 'EzccfX8JQQs25lz7/X1UHnQz0ykildby3ZMqvnSOWAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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