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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6504fe3b8f650a988fb19e41bc244298f8e073bc3d4bd6f422f055a8237fd8f0' 
  AND token = '4jTX1/78JB46/znciYvv049OdClW2pce7eIC5+wRqFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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