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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e32de1de53ed1b9d3a2513fa614a6c3a3e9ed0bc48b9f82e80b7850803c95894' 
  AND token = 'oKctKY4JRlhHrgQURKe4bGmZBmHrnBN1D60PiTTnDpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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