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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6bdb812c0e5ff18e2dc8b98d11d9a9fed4953306bb977fc3e8031df139f4485' 
  AND token = 'b9mo6R795Wk0rtr0HbdaUF24LK+V0jLPPVpbLuBSLfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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