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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b4ea911e9aa24f6761ac9e6a76aaf301f4a88b8439f883e9b5c6163c1acc10' 
  AND token = 'oc+pZ8EdmI8ueungQkc69Vt4NS1EkVLyGzSq+yH1bQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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