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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e5a647ae7363ad0e2dd5fae85bee633e6da4ca40e48509d86b9062693603c1' 
  AND token = 'b43P/gYk+hmRMl72bDGPj9DZJete3qy8An2WIseNQ2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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