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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08483b22a986c1de0b5ca5b14d7fe5a76bd53c20eebe08c6b468cc03cbc5ccb' 
  AND token = 'NHw3kOnJEmP46gct6hYdyXH8eXatcSml0yPKCcOVOUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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