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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae39dd7e78dc602fb685b635ffc3a69fcd74c1eabd8e41eaf349dc45707a0c13' 
  AND token = 'Eo1hI2RgD9rXVqe6Ste3l6htbjslf1tbl5GFNSvbRnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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