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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939fcdd53dfc972ae1c2a6abd9b829de488ab45c432a6d93f79f49c11933e5cd' 
  AND token = 'Ebipai8xSMh/Vl2Xoky5gkmumAtOCRVesSipe5N4hko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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