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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a58cb3c0790830033f17460af1be44bb8d6143b6fc0fc0c799a0c43f634b76d' 
  AND token = 'xH07YIZRgARcEej7+YC+0vJlxV43WRap91snugPKets=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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