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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28904cb0ee3ecebb9f24c963e6cef217f831006385bcbc2ca97c3db68eec65cd' 
  AND token = 'z8p4u8yzgb1E5wgSKxMrpcICaweMd+MM/yIyN4dvE1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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