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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f31aa042db229cb744036ea92fce2cb8d56657180f3c0bc30cb493075a4521' 
  AND token = 'j9+kvWuUd90H0t2evEebHKSSybChg0YWVh5t8ARbWmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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