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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c83114ae72c567243005bdfeacd90b18bab506710a4b9f8d8d53c448e6a794' 
  AND token = '3NielYBuAyObCB90M36p5CpB94axpQjLYyU/+BHHTXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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