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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678372212b24929b97ba6b0b59bd02653400b4b8f3b5ed0a9c9cd6c768dcbcec' 
  AND token = 'NrYBu78VQmokLkf6KbpLkQoncsd0mo8AMezzxIFa30w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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