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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2936a38283f06b14174cf381967b4e078a0bf3b9da5812e2e4aee9614fc25928' 
  AND token = 'okkbckwh+uw2Db5Msz+FtB9aUd2z+wL86uBDICVcs+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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