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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf225b01ffa43012d8cce950d06d80d20927649154e3acde8d833a16385c24b7' 
  AND token = '7BhRsmcWwIrzxdCjbQuWdKdscL/M+0VIHnJsY8pTN90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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