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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b08d25cfacbd606116b3a40cbe2cd7f44c84b412809d7c2820d6ec77dab9af' 
  AND token = '0yjrbWL77Csxxtx+CLGFrWRfiTXDVFIXhMwNtELl/Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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