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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30011721ccb69c4586c46f5b943d263b6efe270be2c8eb13071bc571556a8b6d' 
  AND token = '9Oe9SZhF1m6VherUQqatzJ+dveerGbFncSCuCWqx9fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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