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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c48750657694ec7883f876db0a1b0bb3ac354b598de8e4487ae4c71eb1661ce' 
  AND token = 'LBvzZ0d4DLx5SsM3jfNhhE7vxLMD6m63VbOvc29OY+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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