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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405b86fe73389a8dbaf1ed736c84d163ee6b17ad635369da362f3eae7011892c' 
  AND token = 'Kpt3dkmr0Rh4ERGX5NSJF+CLgqt1WCnXlZp55t5A5eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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