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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad99910b5b8e2ce3dda6b1965de7dfd422bd4928680f10c92191693a0b484ae' 
  AND token = 'ZeNeHYagmayzFWSIyvCi3BBF/Jliak+Ui1zL7QZiz9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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