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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b202418bc02073d3f24423dcf7667b650f164d6e7e1fe60d4f2352f1fd66a72a' 
  AND token = 'XmNlecUWxpvFRahnjDK20a500IHUu43lVoWJA2MBg/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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