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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1736e8c5eea6fb1c112937c1ff272b81a3d9a49a69cf4cdda2ffe6f4d0fc411d' 
  AND token = 'mPq1JRn961U4E81hwGSrQPLhIYxeRxwDw1JnqtsqYq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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