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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972bb7269990e6b8e788be9d38c9bb09a8632de24f18ccd038fb9e181ffaa722' 
  AND token = 'EgAlKpfnFoB2b2VmfuDtj8XkasoQS7FK7eTGg+DeoSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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