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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11142564117de62acb27c5ee4c6d236a4704aa8c4335344ae5c8317135bf1da' 
  AND token = 'OawIf0NJSDidI/l2Pw8yQKhIOiCra+fy3J0vkWjvV4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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