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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf5ac48a00b68f64b0ba87bd777202d086c6a6c959ea55d05e03979f11a7cbc' 
  AND token = 'szsXdgfuu4PF75e1wGkQusZLYj6VJw4lWw//nwa5I78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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