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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e30b6cba1106223c8ddfbd8a3ee23e8c9a1058d6fbbfea6a262fca25f86a97b' 
  AND token = 'lc7yGpUlmFNzYRiHqrl9HK881DpUCyfqR4bnUvY0gyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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