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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508cbf22b382b96b99142bcd103011c62a1c4fb209ae04e0e8b8fcc5de8bd905' 
  AND token = 'J58i4QUZULvUftoirJbonwO1Zzo8aJ5Ui9anIqFFGN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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