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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01b1e62570de30fd53282b81a8521b4a79cc87e55c82c8c554f6fae16ca2ac8' 
  AND token = '1g8ihIHtxLo6BfDRBWeSnUe2+fo4dJEkDTa4cEBkVck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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