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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf27ede61e4005be9f8e384d07a5c8e8167c1a023b6e7cf55936a8ae38852cc' 
  AND token = 'yxKm8PQhsmay7VvZGZnTlbOcLTRfyAdPB8TzOCUKABU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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