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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3830a1ddea204f03667dd63d5a759e180ad16da38ad3ab64a868a1f01e0d78e3' 
  AND token = 'CvGTmh0c1kjM+OXq3JqQw1frs/Fq5Bg7m3r/wSod1cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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