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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b1be50505f269e62c5e096be7e6ae0b6dd62b11edaf183e44d079c95a785b4' 
  AND token = 'sTnGoxucKLxyfqjbbWtinSMkuD6e7zu2pjQSvJy+uio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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