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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d3e04dede97294a6cc95586d3915d0cf88cb1bf83f4658289abd4d9de15398' 
  AND token = 'NogOSW4Glq4682RTmk30hSwC8vVGFj7M5DzvprS4TbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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