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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d51e174c7ae32bbcafe62a37bddec886fe2ee1df941e487957c8bbde49a7e54' 
  AND token = 'b3E51NjNYZvHQ2LEZqpl5ev+/+vQ+ul9v/jGISk18SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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