SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65caad1a270c0d1bc113179b63397122a51482f24694e73a6357824a75005238' 
  AND token = '7FMVfBMfZD8Y2j8y9Pty/Plgo8+wZ+a6RCSZgY5pK8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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