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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4c3b1ed36fa46e0b9c393e0c7e4330c35973037ec40d301d9dfc9ee1d93ad0' 
  AND token = '8pQDcoUuDwNCggeUgO5sgPqCpac+/Iz7UWFjeNqHW28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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