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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc65b3c14564523c3d232d4f5d91b461e727eef247141174dd36beed67e0826' 
  AND token = '3OQ+cFVr6xHOM2fMv6gVxfoBfaiNyIww1PVvMyQ2sw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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