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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10125375f319b83a70feb7bbd93db5a791934cab3eafee47f46f8b44d446346f' 
  AND token = '7rAldg40tDpyp4LnFdhhvyohn8F61MYqf55Q6qx6rvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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