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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc5eb1bf7e2a71e68c291a8ea796b4c504319340b8faf01420f51fd2da71cf3' 
  AND token = '7KPvt1j9iF/29djkaAVD+ud1WLGiKXV/0DURFh0qoXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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