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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b325468c40f3fbe3e9e11bd35742cdc5d21cfb0d0e2d06fca2944992556b83c' 
  AND token = '1h+g8DRI+7XFyJx82k7tcKT+s8jxXR5q5zn/BzjdASo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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