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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332a2bd8844f49ce426724cb6669ddf765dbdb3fc91229c517082be62fbd2555' 
  AND token = '5GucljDzCA6A0++sdNIBt9HCmxALfq97iPFxqjClOQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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