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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bf79468cbe8ae4fc58891dbef1b860b4714ae95c36bde3e63503a4ccb70b71' 
  AND token = 'ieaioElfYuAT5nxKFIfzW1723vEd2VgiOPP3rAl3lHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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