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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e8da568d8ee1d6683b040d343ed81011776d72b7ba7e020c71104c6f5761ee' 
  AND token = 'N6OGIx1dgsVyamAfK03hPjdJH2S3frirDo5zZSPbmPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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