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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7160012e4e9f632e2d6e170060c42d8dd2f49d0c459034139ab25c754cc7f942' 
  AND token = 'zfQLH1fO7HUCdIyJpI66a3BYZLgRt8Jiiqtt9Yt3yhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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