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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6204ed4dc1a5f5dd19dddfe04ab7d3d0a1a7f50ebb5c44de640b9cc7d11ee972' 
  AND token = 'D8ZGzIyuXdJ98ZQReARTkG/2NofzMNdU2J4Uh11cq4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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